In 1999, while sitting at a bus stop in Cuernavaca, Mexico, a Czech physicist named Petr Šeba noticed young men handing slips of paper to the bus drivers in exchange for cash. It wasn’t organized ...

The average temporal avalanche shape has been measured for earthquakes 6 and for dislocation avalanches in plastically deformed metals 7,8, but the primary experimental and theoretical focus has ...

I am writing to express my grave concern as to the current policies and practices of the U.S. government with regard to visas for scientists from Cuba. The president-elect of the Federation of Latin ...